How to Prevent a Nitrous Backfire

A nitrous backfire occurs when there is an abundance of nitrous injected into the engine cylinders for a given combustion cycle. This is generally caused by having the nitrous rpm window set at either too high or too low of a value. Modifying the rpm window to appropriate values will prevent nitrous backfires.

Instructions

1

Check the rpm window setting of your nitrous system. This indicates the minimum and maximum rpm values at which the system injects nitrous into the engine. Also, determine whether the nitrous backfires are occurring at a low or high rpm value.

2

Increase the minimum rpm value of the window if you are experiencing nitrous backfires at a low rpm value. When the engine is operating at low rpm, it is incapable of fully combusting the nitrous content in the cylinders. The excess nitrous is therefore forced into the exhaust system, where it ignites and creates a backfire. Raising the minimum value of the rpm window ensures that nitrous is not injected into the engine at an rpm value that is too low for proper combustion.

3

Decrease the maximum rpm value of the window if you are experiencing nitrous backfires at the rpm redline, such as between shifts at full throttle. When the engine reaches its rpm redline, the fuel system is automatically tuned to cut out. This ensures that the engine is not over-revved, which would damage the engine internals. When the engine experiences fuel cutout at redline, any nitrous that is injected into the engine will not be properly mixed with fuel. This leaves an abundance of nitrous in the engine cylinders, which leads to backfiring.

4

Switch to a lower-flowing nitrous jet if you are still experiencing backfire issues. The flow of nitrous is controlled by the size of the injector jet installed in the system. If the jet is too large it will inject too much nitrous into the engine to be properly combusted. Switching to a lower-flowing nitrous jet restricts the nitrous flow and prevents backfires caused by excess nitrous in the engine.